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Which observation does the anticyclonic limit explain?

  • A.Anticyclones move more slowly across the chart than cyclones of comparable size and intensity do
  • B.Highs bring clear weather
  • C.The strongest winds on a chart are usually found at the boundary between a high and a low centre
  • D.Deep lows are common while deep highs are not

Answer: D

Because the anticyclonic balance admits no solution beyond a limiting pressure gradient, there is a dynamical ceiling on the intensity of a high that has no cyclonic counterpart. Observed sea level pressure extremes bear this out, with record lows far further from the mean than record highs. The clear weather of a high follows from subsidence rather than from the balance limit, and the speed of movement is governed by the steering flow. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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